| 摘要 |
PROBLEM TO BE SOLVED: To improve turbine efficiency, by reducing an energy loss, by smoothing a flow of compressed air. SOLUTION: A main spindle 3 is rotatably supported by a bearing part, for example, a journal bearing part 4 supporting the main spindle in the radial direction a noncontact state by static pressure of the compressed air introduced to a journal bearing clearance, and thrust bearing parts 5a and 5b supporting the main spindle in the thrust direction in a noncontact state by the static pressure of the compressed air introduced to a thrust bearing clearance. The compressed air is blown from turbine nozzles 12 upon a plurality of recessed parts 11 arranged in an outer peripheral part of the main spindle 3, and rotational motive power is applied to the main spindle. Here, the recessed parts 11 and the turbine nozzle 12 are arranged in double rows, and the center line of the double-row recessed parts 11 is set in parallel, and when the respective turbine nozzles 12 are slantingly arranged to the center line of the recessed parts in the direction reducing a nozzle interval in the axial direction on the inner diameter side, a flow of the compressed air in the recessed parts 11 becomes a single flow, and the energy loss can be reduced. COPYRIGHT: (C)2008,JPO&INPIT
|
